6QIU

Crystal structure of 14-3-3 sigma in complex with Ataxin-1 Ser776 phosphopeptide

• PDB DOI: https://doi.org/10.2210/pdb6QIU/pdb

• Classification: PROTEIN BINDING
• Organism(s): Homo sapiens
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2019-01-21 Released: 2020-05-13 
• Deposition Author(s): Leysen, S., Milroy, L.G., Davis, J.M., Brunsveld, L., Ottmann, C.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.80 Å
• R-Value Free: 
  0.193 (Depositor), 0.194 (DCC) 
• R-Value Work: 
  0.147 (Depositor), 0.148 (DCC) 
• R-Value Observed: 
  0.149 (Depositor) 

Literature

Structural insights into the cytoplasmic chaperone effect of 14-3-3 proteins on Ataxin-1

Leysen, S., Burnley, R.J., Rodriguez, E., Milroy, L.G., Soini, L., Adamski, C.J., Davis, R., Obsil, T., Brunsveld, L., Crabbe, T., Zoghbi, H.Y., Ottmann, C., Davis, J.M.

To be published.

Biological Assembly 1  

Global Symmetry: Cyclic - C2  (Explore in 3D)
Global Stoichiometry: Hetero 4-mer - A2B2 Pseudo Symmetry: Asymmetric - C1 
Pseudo Stoichiometry: Hetero 4-mer - A2B1C1 

Biological assembly 1 generated by PISA (software)

Biological Assembly Evidence: gel filtration

Macromolecule Content

• Total Structure Weight: 27.96 kDa 
• Atom Count: 2,560 
• Modelled Residue Count: 246 
• Deposited Residue Count: 246 
• Unique protein chains: 2

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
14-3-3 protein sigma	A	236	Homo sapiens	Mutation(s): 0  Gene Names: SFN, HME1
UniProt & NIH Common Fund Data Resources
Find proteins for P31947 (Homo sapiens) Explore P31947  Go to UniProtKB:  P31947
PHAROS:  P31947 GTEx:  ENSG00000175793

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
Ataxin-1 phosphopeptide	B [auth P]	10	Homo sapiens	Mutation(s): 0
UniProt & NIH Common Fund Data Resources
Find proteins for P54253 (Homo sapiens) Explore P54253  Go to UniProtKB:  P54253
PHAROS:  P54253 GTEx:  ENSG00000124788

Small Molecules

Ligands 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
CL	D [auth A]	CHLORIDE ION Cl VEXZGXHMUGYJMC-UHFFFAOYSA-M
MG	C [auth A]	MAGNESIUM ION Mg JLVVSXFLKOJNIY-UHFFFAOYSA-N

Modified Residues  1 Unique
ID	Chains	Type	Formula	2D Diagram	Parent
SEP	B [auth P]	L-PEPTIDE LINKING	C3 H8 N O6 P		SER

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.80 Å
• R-Value Free:  0.193 (Depositor), 0.194 (DCC) 
• R-Value Work:  0.147 (Depositor), 0.148 (DCC) 
• R-Value Observed: 0.149 (Depositor) 

Space Group: C 2 2 2₁

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 82.662	α = 90
b = 111.948	β = 90
c = 62.742	γ = 90

Software Package:

Software Name	Purpose
PHENIX	refinement
Aimless	data scaling
PDB_EXTRACT	data extraction
XDS	data reduction
PHASER	phasing

Structure Validation

Entry History 

Deposition Data

• Released Date: 2020-05-13 
Deposition Author(s): Leysen, S., Milroy, L.G., Davis, J.M., Brunsveld, L., Ottmann, C.

Revision History  

• Version 1.0: 2020-05-13
  Type: Initial release
  
• Version 1.1: 2024-10-09
  Changes: Data collection, Database references, Derived calculations, Structure summary